碳含量对致密 Na3V2(PO4)3/C 复合材料离子导电率和电子导电率的影响

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2024-03-07 DOI:10.1016/j.powera.2024.100144
Pradhyun Veerapanaicker Soundaraj , Enkhtsetseg Dashjav , Daniel Grüner , Stephan Prünte , Christian Dellen , Frank Tietz
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引用次数: 0

摘要

三聚磷酸钠(Na3V2(PO4)3,NVP)是一种很有前途的钠离子电池阴极材料。由于其固有的低电子传导性,它通常与碳混合或与碳涂层在一起。然而,迄今为止还没有关于碳包覆 NVP 粒子的离子和电子导电性的系统研究。在这项工作中,制备了不同碳含量的 NVP。将这些粉末烧结成单个颗粒或夹在固体电解质中,在离子阻挡和非离子阻挡配置下进行测量。在这两种不同的配置中,连接了两个不同的电极,并应用了多种电化学表征技术,如阻抗光谱法、时变测量法和四点测量法。碳含量为 0.1 wt% 的 NVP/C 复合材料显示出高度致密化和无定形碳网络。碳含量为 0.1 wt%的复合材料中 NVP 的电导率以离子传导为主,平均值为 ∼2 × 10-6 S cm-1。碳含量为 0.1 wt%的 NVP/C 样品由于晶界处的渗碳网络而显示出 0.01-0.2 mS cm-1 范围内的电子传导占主导地位。然而,离子导电率几乎保持在同一数量级(∼6 × 10-6 S cm-1)。
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Influence of carbon content on the ionic and electronic conductivities of dense Na3V2(PO4)3/C composites

Sodium vanadium triphosphate (Na3V2(PO4)3, NVP) is a promising cathode material for Na-ion batteries. Due to its intrinsically low electronic conductivity, it is usually mixed or coated with carbon. However, so far there have been no systematic studies on the ionic and electronic conductivity of carbon-coated NVP particles. In this work, NVP with varying carbon contents are prepared. The powders are sintered as single pellets or sandwiched between a solid electrolyte for measurements in an ion blocking and non-ion blocking configuration. In these two different configurations, two different electrodes are attached and several electrochemical characterization techniques are applied such as impedance spectroscopy, chronoamperometry, and four-point measurements. The NVP/C composites with carbon content >0.1 wt% show a high degree of densification and an amorphous carbon network. The conductivity of NVP in composites with carbon content <0.1 wt% shows dominating ionic conduction with an average value of ∼2 × 10−6 S cm−1. NVP/C samples with carbon contents >0.1 wt% show a dominance of electronic conduction in the range of 0.01–0.2 mS cm−1 because of the percolated carbon network at the grain boundaries. The ionic conductivity, however, remains almost constant in the same order of magnitude (∼6 × 10−6 S cm−1).

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CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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